Door-control appliance



Nov. 12, 1929. .H. TRENKAMP DOOR CONTROL APPLIANCE Filed May 15, 1928 Patented Nov. 12, 1929 HENRY TRENKAMP, or crewman, euro 1 DOOR-CONTROL APPLIANCE Application filed May 15,1928. Serial No. 277,852; 7

My invention pertains to a door control appliance and more particularly to a counterweighted roller connection between a stove oven door and the frame which defines the enl trance to the oven and to which the door is a not elsewhere hinged. V

My many years manufacturing experience with domestic stoves has made me aware of the highly developed state of the art as disclosed in part by United States Patents Nos. 1,405,290; 473,978; 475,263; 574,941.

The object of my invention is to apply the counterweighted door control principle in a more satisfactory manner. springs to control oven doors has the disadvantage that the temper, and hence efficacy of the spring, is unfavorably affected when employed in a heated zone. While counterweights have long been employed their restraining or controlling action has not been uniform throughout the arc of movement of the door and they have usually involved an excess of gravitational influence at some stage of theirswinging movement to cause a thumping or slamming of the door. My invention eliminates hitherto obtaining ob ections by providing what might be termed a continuously uniform restraint to the swinging action of the door in either direction. I accomplish my object by providing control arms with arcuate surfaces which are concentric with the swing axis and which constantly rub or bear against anti-friction rollers.

It is to be realized that the scope of my invention comprehends many equivalent constructions. The showing of the drawing and r the particular description are merely a specific exemplification of a plurality of mechanical embodiments and arrangements.

Adverting to the drawing: Figure 1 is a rear or inside elevation of a stove oven frame and door carried thereby after the manner of my invention and showing the door in its closed position. Figure 2 is a vertical section on line 2-2 of Figure 1 looking in the direction of the indicating arrows.

Figure 3 is a view corresponding to Figure 2, but showing the door swung to its open position. 1

The use of V Figure 4 is an enlarged section on line 4-4 of Figure 1 to more clearly show certain .de tails of construction, the door being shown in partly open position. 1 A frame 1,which may be considered as constituting a part of the frontof a stove oven, defines an opening 2 through which access to the confines of theoven is to be, had when the door is open. Opposite lateral sides of the frame 1 are provided near the lower corners of the frame with vertically elongated slots 3 and just below each of the slots 3 the frame 1 carries a pair of spaced-inwardly projecting ears 4, through both of which pairs a cotter pin 5 is passed. Rotatably mounted on each of the pins 5 is a composition antifriction roller 6.

A door 7 provided with ahandle 8 is adapt edto close the opening 2 in the frame. Rigidly carried by the insideof the door 7 at. points correspondingly spaced and in the same vertical planes as the slots 3, are a pair of peculiarly formed arms 10 which project rearwardly through the slots 3 respectively. The lower sides or edges 11- of the arms conform to circular arcs which are concentric with the axis about which .the door is to swing and are adapted constantly, to bear against the rollers 6, as clearly appears in Figure 4. The inner extremities of the arms 10 areabruptly bent at 12 toward.

the plane of the door 7 and each detach'ably carries a counterweight 13 through the agency of a securing pin 14, which is purposed to fix the counterweights in a selected position with V respect to the extremities 12. As disclosed in Figure 3, the arrangement is such. that the points of attachment of the counterweights abut the pairs of ears 4 when thedoor reaches its full open or substantially horizontal position. It should be understood,that the chosen operative relation of the parts and the disposition of the mass of the counterweights, is a so predetermined as to insure substantial uniformity in the exercise of the controlling action, during the swinging movement between the two limits illustrated in Figures 2 and 3. To the realization of this desired object, the

rolling engagement between the arcuate edges 7 lland rollers 6 area contributing factor 2, j V r 1,735,661

' which is believed to be novel as well as useful. The need of a conventional type of hinges along the lower edges of the door has been proven to bequite unnecessary, the constantly balanced'support of the door on the outside and the weights on the inside eifectingvan V entirely satisfactory though sole. gravitational;:suspension of the door.

I clai1n: V 10 1. In a door control appliance, the combi- V nation of a frame defining an opening and itself fashioned on opposite sides with slots and also'with inwardly projecting lugs near thelower ends of said slots, anti-friction 1 15 rollers carried by said lugs, anda door car- 80 and also with inwardly projecting pairs of spaced ears nearthe lowerends of said slots, an anti-friction roller carried between e'ach V pair of said ears, adoor carrying on each lateral side a peculiarly shaped arm said 35 arms projecting through said slots and having'th'eir lower edge surfaces conformingto circular arcs about points in a straight hori} zontal line as'centers, said lower edge sur-j v faces of the arms constantly engaging said 40 rollers respectively, the extremities of said' arinsbeing abruptly" bent and adapted to abut said ears and limit the downward swing of the door to a substantially horizontal position and counterweights adjustably carriedf 45 by thefbentends of said arms. s

' Signed by me, this 11th day of April, 1928. HENRY TRENKAMP. 

